Gold English double-sided world time watch Circa 1900

Gold double-sided world time watch by C. Marcks & Co.
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A representative English double-sided gentleman’s pocket watch with 24h day/night indication – for the Indian market, circa 1900.
Polished 18-carat yellow gold case, glazed on both sides. First dial: white enamel with radial Roman numerals, outer minutes track, subsidiary dial for the seconds, and spade hands; Second dial: white enamel with Roman numerals, I-XII in each half, outer dot minute divisions, and a rotating central disc inscribed with 79 world locations. Bridge movement with gold screw compensation balance. Dial signed C. Marcks & Co, Bombay & Poona.
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Diameter: 50 mm
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Weight: 96 g
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Signed: C. Marcks & Co. Bombay & Poona
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After the universal day of 24 hours beginning at Greenwich midnight was adopted during the International Meridian Conference in October 1884, watches that showed two time zones quickly became very popular. This timepiece was produced for Marcks & Co., one of the best-established watch and jewellery traders on the Indian subcontinent; it has an enamel ring on the back that shows the local time of 58 world cities.